@article{JETPL.104.701, title = {}, author = {, and , and Shalashov, A. G.}, journal = {JETP Lett.}, volume = {104}, issue = {10}, pages = {690}, year = {2016}, doi = {}, url = {http://jetpletters.ru/ps/dx/10.7868/S0370274X16220070}, note = {[Pisma v ZhETF 104, 701 (2016)]} }